Portable drainage device



FIG. 1 is a perspective view of our portable drainage device;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a right end elevational view;

FIG. 5 is a left end elevational view;

FIG. 6 is a top plan view; and

FIG. 7 is a bottom plan view. 

The ornamental design for a portable drainage device, substantially as shown. 